Matsushiro Underground Imperial Headquarters

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36°32′45″N 138°12′14″E / 36.545811°N 138.203931°E / 36.545811; 138.203931

The Matsushiro Underground Imperial Headquarters (松代大本営, Matsushiro Daihon'ei, "Matsushiro Imperial Headquarters Site") was a large underground bunker complex built during the Second World War in the town of Matsushiro, which is now a suburb of Nagano, Japan.^[1] The facility was constructed so that the central organs of the government of the Empire of Japan could be transferred there in the event of an Allied invasion. In its construction, three mountains that were symbolic of the Matsushiro municipality were damaged.

Parts of the caves are open to the public today, and are operated as a tourist attraction by Nagano.